Log-turning mechanism.



No. 721,409. PATBNTBD PEB. 24,1903.' W. M. WILKIN.

LOG TURNING MECHANISM'. APPLIOATION FILED ,mi a, A1902.

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UNITED STATES WILLIAM M. WILKIN, OFV MOBILE, ALABAMA.

L'Loc-TURNING MEcHAN-lsM-,

SPECIFIGATION forming part of Letters PatentvNo. 721,409, dated February24, 1903.

Application filed May 6, 1902. Serial No. 106,151. (No model.) I

To @ZZ whom it may concern:

Be it known that I, WILLIAM M. WILKIN,

a citizen of the United States, residing at Mobile,in the county ofMobile and State of Alabama, have' invented certain new and usefulImprovements in Log-Turning Mechanism; and I-do hereby declare thefollowing to bea full, clear, and exact description of the invention,such as will enable-others skilled in the art to which it appertains tomake and it consists, ntcrctlz'a, in providing the mech anism with anauxiliary mechanism which performs the functions of rolling a log fromthe lower end of the logway upon the sawcarriage and also of forcing thelog up against the saw-carriage knees and of holding a partially-turnedlog while the toothed turningbar is being moved downward to take anotherhold, so as to complete the turning of the log.

Another feature ofr my invention consists in pivoting the cylinderoperating the turning-bar at its base and making the turningbar with anoifset therein,pivoting it to the piston-rod of the actuating-cylinderand to a swinging link, so that as the toothed turningbar moves upwardit will automatically move toward the log and press against it withsufficient force to engage its teeth therewith Without shoving the logupward against the carriage-knees, and as it moves downward it will tend-to move back from the log.

Another feature of my invention is the construction of the toothed barwith reversible teeth removably pivoted therein, so that in case ofbreakage they can be reversed.

These and other features of my invention are hereinafter set forth anddescribed, and illustrated in the accompanying drawings, in which-Figure lis a side view in elevation of a logturning mechanism embodyingmy invention with sections of a saw-carriage and logway. Fig. 2 is a topor plan View of the same. Fig. 3 is a view of a section of the samelooking toward the logway. Fig. 4 is a view, partly in elevation andpartly in section, of the upper part of the turning-bar. l

In the construction of the invention illustrated in the drawings theframework A and A', the saw-carriage B, the carriage-knees B', and thelogway C are of the usual construcbase-frame A', its valve mechanism d,the

auxiliary cylinder E, mounted on said base, and its valve mechanism e,with the valve connections d and d2, connecting the valve dwithranoperating-lever, (not shown,) and the conmeeting-rod e', connectingthe valve e with an operating-lever, (not shown,) are all substantiallythe same in construction and operation as are fully shown and describedin Letters Patent No. 559,426, granted to me on May 5, 1896, andtherefore further description thereof herein is deemed unnecessary.

In the main cylinder D there is the usual piston, (not shown,) withwhich the piston-rod D connects, and to the upper end of the piston-rodD', I pivot a toothed bar F and also the end of a link G, the other endof which is pivoted to the framework, so that as the piston-rod D movesup and down the end thereof moves in the arc of a circle, the radius off which is the link G. The toothed bar F, I

make of two fiat bars F F', so that the teeth II, hereinafter described,can be pivoted between them, and the lower end of the toothed bar' isprovided With a curve or offset F2 toward the front of the carriage Bwhich brings the vertical portion thereof considerably out of line withthe side of the piston D and operates to swing the upper end of thetoothed 'bar F toward the carriage B as it is moved upward. The two barsF F', forming the bar F, are secured together `by means of rivets of thelower part of the tooth is sufficient to IOO always return it to itsnormal position, and in case one of the teeth is broken off the toothcan be reversed in the bar. The operation of the tooth-bar and the teeththerein upon a log or square cant as the bar moves upward is clearlyillustrated by dotted lines in Fig. 1.

As an auxiliary to and cooperating with the mechanism hereinbeforedescribed I secure aframe I to a support J upon the framework A directlyunder the logway C, which frame I embraces the tooth-bar F and isprovided at the front end thereof next the carriage B with stops t' t',against which the front edges of the bars F' F' of the tooth-bar Foperate to prevent the tooth-bar striking the log-carriage B, and onthis frame I at each side of the opening for the tooth-bar F therein Ipivot the front end of a swinging arm or lever K, and to the rear end ofsaid lever or arm K, I pivot a link L, the opposite end of which ispivoted to the upper end of a link L', pivoted to the upper end of thepiston-rod E' of the auxiliary cylinder E, and to the lower end of thelink L and the upper end of the link L', I pivot one end of another linkM, the opposite end of which is pivoted to the framework A, so that whenthe piston-rod E' moves upward the links L, L', and M operate upon thelever or arm K to raise it against a log or squared cant on the ways Cand move it against the knees B' of the saw-carriage B, as illustratedby dotted lines in Fig. 1, and hold the log firmly against the knees B'of the carriage B while the tooth-bar is operating thereon to turn it.

From the foregoing description the operation of my invention is soobvious that further description thereof is deemed unnecessary.

Therefore, having described my invention so as to enable others toconstruct and utilize the same, what I claim as new, and desire to secure by Letters Patent of the United States, 1s-

1. The combination in a log-turning mechanism of a vertical maincylinder mounted upon a supporting-base pivoted to the lower headthereof, a vertical auxiliary cylinder mounted upon a supporting-base,apiston and piston-rod in said main cylinder, a tooth-bar pivoted to andolfset vertically from the piston-rod, a link pivoted thereto at one endand to the mill-frame at the other, a frame under the logway, throughfront end of which the tooth-bar operates, an, arm or lever pivotedthereto at its front end at the sides of the tooth-bar passage therein,a link pivoted at one end to the rear end of said arm or level', and atthe other end to a link extending to the piston-rod of the auxiliarycylinder, and also to a link pivoted at one end to the millframe,substantially as set forth.

2. In a log-turning mechanism, the combination with a vertically-movingtooth-bar, of a fixed frame, through the front end of which thetooth-bar operates, an arm or lever pivoted to the front end of saidframe, a link pivoted at one end to the rear portion of said arm orlever, and at the other to a link extending to the piston-rod of anauxiliary cylinder and also to a link pivoted at one end to themillframe, substantially as set forth.

3. In a log-turning mechanism, the combination of a vertically-movingtooth-bar, and a vertical cylinder and piston operating the same, afixed frame the front end of which operates as a guide for thetooth-bar, an arm or lever pivoted to the front end of said frame, anauxiliary piston and piston-rod, an extension pivoted to the upper endof said pistonrod, and two links pivoted to the upper end thereof, oneof which extends to and is pivoted to said lever, and the other to andis pivoted to the mill-frame, substantially as set forth.

4. The combination in a tooth-bar for logturners, of a bifurcated frame,reversible teeth H pivoted on removable pivots f2 therein, stops f andf' in said bar, a projection h2 on said tooth adapted to engage the stopf', and a projection h' on said tooth adapted to engage the stop f,substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM M. WILKIN.

Witnesses:

H. M. STURGEON, F. J. BAssE'rT.

